damjan_savicandClaude Opus 4.5
43484c5023
- Add 100 blog posts covering AI, development, and tech topics - Add .env.example for environment configuration - Add accessibility and lighthouse audit scripts - Remove obsolete SEO reports and temporary files - Remove dev-dist build artifacts and backup files - Remove unused portrait images (moved/consolidated elsewhere) - Update contact form and component improvements Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
767 lines
20 KiB
Markdown
767 lines
20 KiB
Markdown
# Raspberry Pi IoT Projekte mit Node.js
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**Meta-Description:** IoT-Projekte mit Raspberry Pi und Node.js. GPIO-Steuerung, Sensor-Integration, MQTT und Web Dashboards.
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**Keywords:** Raspberry Pi, Node.js, GPIO, IoT, Sensors, Home Automation, MQTT, Embedded Linux
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---
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## Einführung
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Der **Raspberry Pi** ist der perfekte Single-Board Computer für IoT-Projekte. Mit **Node.js** kombiniert man die Hardware-Nähe mit dem mächtigen npm-Ökosystem für Web-basierte IoT-Anwendungen.
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---
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## Raspberry Pi Setup
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```
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┌─────────────────────────────────────────────────────────────┐
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│ RASPBERRY PI 5 SPECIFICATIONS │
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├─────────────────────────────────────────────────────────────┤
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│ │
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│ CPU: Broadcom BCM2712 quad-core Arm Cortex-A76 @ 2.4GHz │
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│ RAM: 4GB / 8GB LPDDR4X-4267 │
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│ │
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│ Connectivity: │
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│ ├── Gigabit Ethernet │
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│ ├── Dual-band WiFi 802.11ac │
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│ ├── Bluetooth 5.0 / BLE │
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│ ├── 2× USB 3.0 + 2× USB 2.0 │
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│ └── PCIe 2.0 x1 │
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│ │
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│ GPIO: │
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│ ├── 40-pin GPIO Header │
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│ ├── 26 GPIO Pins │
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│ ├── I2C, SPI, UART │
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│ └── PWM (Hardware) │
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│ │
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│ Storage: microSD / NVMe (via HAT) │
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│ Power: 5V/5A USB-C │
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│ │
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│ GPIO Pinout (Subset): │
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│ ┌────┬────┬────────────────────────┐ │
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│ │ 1 │ 2 │ 3.3V | 5V │ │
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│ │ 3 │ 4 │ GPIO2 | 5V │ │
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│ │ 5 │ 6 │ GPIO3 | GND │ │
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│ │ 7 │ 8 │ GPIO4 | GPIO14(TX) │ │
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│ │ 9 │ 10 │ GND | GPIO15(RX) │ │
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│ └────┴────┴────────────────────────┘ │
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│ │
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└─────────────────────────────────────────────────────────────┘
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```
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---
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## Node.js Installation
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```bash
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# Node.js via NodeSource (empfohlen)
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curl -fsSL https://deb.nodesource.com/setup_22.x | sudo -E bash -
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sudo apt-get install -y nodejs
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# Alternativ: NVM (Node Version Manager)
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curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.40.0/install.sh | bash
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source ~/.bashrc
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nvm install 22
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nvm use 22
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# Verify
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node --version
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npm --version
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# Build Tools für native Addons
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sudo apt-get install -y build-essential python3
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# GPIO Berechtigungen (ohne sudo)
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sudo usermod -aG gpio $USER
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sudo usermod -aG i2c $USER
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sudo usermod -aG spi $USER
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```
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---
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## GPIO Control mit Node.js
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```typescript
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// lib/gpio.ts
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import { Gpio } from 'onoff';
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// LED Control
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const LED_PIN = 17;
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const led = new Gpio(LED_PIN, 'out');
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// LED einschalten
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led.writeSync(1);
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// LED ausschalten
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led.writeSync(0);
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// Asynchrone Steuerung
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async function blinkLED(times: number, intervalMs: number) {
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for (let i = 0; i < times; i++) {
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await led.write(1);
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await sleep(intervalMs);
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await led.write(0);
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await sleep(intervalMs);
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}
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}
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// Button mit Interrupt
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const BUTTON_PIN = 18;
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const button = new Gpio(BUTTON_PIN, 'in', 'both', { debounceTimeout: 50 });
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button.watch((err, value) => {
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if (err) {
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console.error('Button error:', err);
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return;
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}
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console.log(`Button: ${value === 1 ? 'pressed' : 'released'}`);
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});
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// Cleanup bei Programmende
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process.on('SIGINT', () => {
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led.unexport();
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button.unexport();
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process.exit();
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});
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// Helper
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function sleep(ms: number): Promise<void> {
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return new Promise(resolve => setTimeout(resolve, ms));
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}
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```
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```typescript
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// Für Raspberry Pi 5: gpiod verwenden
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// lib/gpio-pi5.ts
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import { Chip, Line } from '@iiot2k/gpiox';
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const chip = new Chip(4); // Pi5 verwendet Chip 4
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// LED Setup
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const ledLine = chip.getLine(17);
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ledLine.requestOutput('led');
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// LED steuern
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ledLine.setValue(1); // On
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ledLine.setValue(0); // Off
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// Button Setup mit Events
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const buttonLine = chip.getLine(18);
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buttonLine.requestInput('button');
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buttonLine.requestBothEdges();
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buttonLine.addEventListener('value', (event) => {
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console.log(`Button value: ${event.value}`);
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});
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```
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---
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## Sensor-Integration
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```typescript
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// lib/sensors/dht22.ts
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import sensor from 'node-dht-sensor';
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const DHT_TYPE = 22; // DHT22
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const DHT_PIN = 4;
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interface Reading {
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temperature: number;
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humidity: number;
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timestamp: Date;
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}
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export async function readDHT22(): Promise<Reading> {
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return new Promise((resolve, reject) => {
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sensor.read(DHT_TYPE, DHT_PIN, (err, temperature, humidity) => {
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if (err) {
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reject(err);
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return;
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}
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resolve({
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temperature: Math.round(temperature * 10) / 10,
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humidity: Math.round(humidity * 10) / 10,
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timestamp: new Date()
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});
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});
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});
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}
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// Retry Logic für zuverlässigere Messungen
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export async function readDHT22WithRetry(maxRetries = 3): Promise<Reading> {
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let lastError: Error | null = null;
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for (let i = 0; i < maxRetries; i++) {
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try {
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const reading = await readDHT22();
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// Plausibilitätsprüfung
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if (reading.temperature > -40 && reading.temperature < 80 &&
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reading.humidity >= 0 && reading.humidity <= 100) {
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return reading;
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}
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} catch (err) {
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lastError = err as Error;
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await sleep(2000); // DHT braucht Zeit zwischen Messungen
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}
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}
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throw lastError || new Error('Failed to read DHT22');
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}
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```
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```typescript
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// lib/sensors/bme280.ts
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import BME280 from 'bme280-sensor';
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const bme280 = new BME280({ i2cBusNo: 1, i2cAddress: 0x76 });
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interface EnvironmentData {
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temperature: number;
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humidity: number;
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pressure: number;
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}
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export async function initBME280(): Promise<void> {
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await bme280.init();
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console.log('BME280 initialized');
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}
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export async function readBME280(): Promise<EnvironmentData> {
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const data = await bme280.readSensorData();
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return {
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temperature: Math.round(data.temperature_C * 10) / 10,
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humidity: Math.round(data.humidity * 10) / 10,
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pressure: Math.round(data.pressure_hPa * 10) / 10
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};
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}
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```
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```typescript
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// lib/sensors/ultrasonic.ts
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import { Gpio } from 'onoff';
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const TRIG_PIN = 23;
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const ECHO_PIN = 24;
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const trigger = new Gpio(TRIG_PIN, 'out');
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const echo = new Gpio(ECHO_PIN, 'in', 'both');
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export function measureDistance(): Promise<number> {
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return new Promise((resolve, reject) => {
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let startTime: bigint;
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let endTime: bigint;
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let timeout: NodeJS.Timeout;
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// Timeout nach 1 Sekunde
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timeout = setTimeout(() => {
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reject(new Error('Measurement timeout'));
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}, 1000);
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echo.watch((err, value) => {
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if (err) {
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clearTimeout(timeout);
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reject(err);
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return;
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}
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if (value === 1) {
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startTime = process.hrtime.bigint();
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} else {
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endTime = process.hrtime.bigint();
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clearTimeout(timeout);
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// Distanz berechnen
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const duration = Number(endTime - startTime) / 1e9; // Sekunden
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const distance = (duration * 34300) / 2; // cm
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resolve(Math.round(distance * 10) / 10);
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}
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});
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// Trigger Puls
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trigger.writeSync(1);
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setTimeout(() => trigger.writeSync(0), 10); // 10µs Puls
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});
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}
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```
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---
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## MQTT Sensor Node
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```typescript
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// apps/sensor-node.ts
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import mqtt from 'mqtt';
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import { readDHT22WithRetry } from './lib/sensors/dht22';
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import { measureDistance } from './lib/sensors/ultrasonic';
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import os from 'os';
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interface SensorNodeConfig {
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brokerUrl: string;
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deviceId: string;
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readIntervalMs: number;
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}
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class SensorNode {
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private client: mqtt.MqttClient;
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private config: SensorNodeConfig;
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private baseTopic: string;
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private running = false;
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constructor(config: SensorNodeConfig) {
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this.config = config;
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this.baseTopic = `sensors/${config.deviceId}`;
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this.client = mqtt.connect(config.brokerUrl, {
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clientId: config.deviceId,
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will: {
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topic: `${this.baseTopic}/status`,
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payload: Buffer.from('offline'),
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qos: 1,
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retain: true
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}
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});
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}
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async start(): Promise<void> {
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await this.waitForConnection();
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// Online Status
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this.client.publish(
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`${this.baseTopic}/status`,
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'online',
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{ retain: true }
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);
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// Device Info
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this.client.publish(
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`${this.baseTopic}/info`,
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JSON.stringify({
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device_id: this.config.deviceId,
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hostname: os.hostname(),
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platform: os.platform(),
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arch: os.arch(),
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uptime: os.uptime(),
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memory: {
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total: os.totalmem(),
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free: os.freemem()
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}
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}),
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{ retain: true }
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);
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// Commands abonnieren
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this.client.subscribe(`${this.baseTopic}/command`);
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this.client.on('message', (topic, payload) => {
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this.handleCommand(payload.toString());
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});
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this.running = true;
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this.sensorLoop();
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}
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private async sensorLoop(): Promise<void> {
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while (this.running) {
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try {
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// Alle Sensoren lesen
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const [dht, distance] = await Promise.allSettled([
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readDHT22WithRetry(),
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measureDistance()
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]);
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const data: Record<string, any> = {
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device_id: this.config.deviceId,
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timestamp: new Date().toISOString()
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};
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if (dht.status === 'fulfilled') {
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data.temperature = dht.value.temperature;
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data.humidity = dht.value.humidity;
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}
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if (distance.status === 'fulfilled') {
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data.distance = distance.value;
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}
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// System Metrics
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data.system = {
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cpu_temp: await this.getCPUTemperature(),
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memory_usage: (1 - os.freemem() / os.totalmem()) * 100,
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load_average: os.loadavg()[0]
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};
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// Publish
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this.client.publish(
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`${this.baseTopic}/data`,
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JSON.stringify(data),
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{ qos: 1 }
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);
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console.log('Published:', data);
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} catch (error) {
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console.error('Sensor read error:', error);
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}
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await this.sleep(this.config.readIntervalMs);
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}
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}
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private handleCommand(payload: string): void {
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try {
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const command = JSON.parse(payload);
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switch (command.action) {
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case 'restart':
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console.log('Restart command received');
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process.exit(0); // Systemd wird neustarten
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break;
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case 'setInterval':
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this.config.readIntervalMs = command.value;
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console.log(`Interval set to ${command.value}ms`);
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break;
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case 'status':
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this.publishStatus();
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break;
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}
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} catch (error) {
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console.error('Command parse error:', error);
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}
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}
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private async getCPUTemperature(): Promise<number> {
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try {
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const { readFile } = await import('fs/promises');
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const temp = await readFile('/sys/class/thermal/thermal_zone0/temp', 'utf8');
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return parseInt(temp) / 1000;
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} catch {
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return 0;
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}
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}
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private publishStatus(): void {
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this.client.publish(
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`${this.baseTopic}/status/detailed`,
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JSON.stringify({
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running: this.running,
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uptime: process.uptime(),
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memory: process.memoryUsage(),
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interval: this.config.readIntervalMs
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})
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);
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}
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private waitForConnection(): Promise<void> {
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return new Promise((resolve, reject) => {
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this.client.on('connect', () => {
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console.log('Connected to MQTT broker');
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resolve();
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});
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this.client.on('error', reject);
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setTimeout(() => reject(new Error('Connection timeout')), 30000);
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});
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}
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private sleep(ms: number): Promise<void> {
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return new Promise(resolve => setTimeout(resolve, ms));
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}
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stop(): void {
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this.running = false;
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this.client.publish(
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`${this.baseTopic}/status`,
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'offline',
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{ retain: true }
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);
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this.client.end();
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}
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}
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// Verwendung
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const node = new SensorNode({
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brokerUrl: process.env.MQTT_URL || 'mqtt://localhost:1883',
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deviceId: process.env.DEVICE_ID || `rpi-${os.hostname()}`,
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readIntervalMs: 30000
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});
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node.start();
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// Graceful Shutdown
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process.on('SIGINT', () => {
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console.log('Shutting down...');
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node.stop();
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process.exit(0);
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});
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```
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---
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## Web Dashboard
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```typescript
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// apps/dashboard/server.ts
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import express from 'express';
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import { createServer } from 'http';
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import { Server as SocketServer } from 'socket.io';
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import mqtt from 'mqtt';
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const app = express();
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const server = createServer(app);
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const io = new SocketServer(server);
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// MQTT Client
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const mqttClient = mqtt.connect(process.env.MQTT_URL || 'mqtt://localhost:1883');
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// Sensor Data speichern
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const sensorData: Map<string, any[]> = new Map();
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const MAX_HISTORY = 100;
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mqttClient.on('connect', () => {
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console.log('MQTT connected');
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mqttClient.subscribe('sensors/+/data');
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mqttClient.subscribe('sensors/+/status');
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});
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mqttClient.on('message', (topic, payload) => {
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const parts = topic.split('/');
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const deviceId = parts[1];
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const type = parts[2];
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if (type === 'data') {
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const data = JSON.parse(payload.toString());
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// History speichern
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if (!sensorData.has(deviceId)) {
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sensorData.set(deviceId, []);
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}
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const history = sensorData.get(deviceId)!;
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history.push(data);
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if (history.length > MAX_HISTORY) {
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history.shift();
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}
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// An WebSocket Clients senden
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io.emit('sensorData', { deviceId, data });
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}
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if (type === 'status') {
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io.emit('deviceStatus', {
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deviceId,
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status: payload.toString()
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});
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}
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});
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// Static Files
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app.use(express.static('public'));
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// API Endpoints
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app.get('/api/devices', (req, res) => {
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const devices = Array.from(sensorData.keys()).map(id => ({
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id,
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lastReading: sensorData.get(id)?.slice(-1)[0]
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}));
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res.json(devices);
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});
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|
||
app.get('/api/devices/:id/history', (req, res) => {
|
||
const history = sensorData.get(req.params.id) || [];
|
||
res.json(history);
|
||
});
|
||
|
||
// WebSocket Events
|
||
io.on('connection', (socket) => {
|
||
console.log('Client connected');
|
||
|
||
// Initial Data senden
|
||
sensorData.forEach((history, deviceId) => {
|
||
socket.emit('initialData', {
|
||
deviceId,
|
||
history: history.slice(-20)
|
||
});
|
||
});
|
||
|
||
// Command an Gerät senden
|
||
socket.on('command', ({ deviceId, action, payload }) => {
|
||
mqttClient.publish(
|
||
`sensors/${deviceId}/command`,
|
||
JSON.stringify({ action, ...payload })
|
||
);
|
||
});
|
||
});
|
||
|
||
server.listen(3000, () => {
|
||
console.log('Dashboard running on http://localhost:3000');
|
||
});
|
||
```
|
||
|
||
```html
|
||
<!-- public/index.html -->
|
||
<!DOCTYPE html>
|
||
<html>
|
||
<head>
|
||
<title>Pi Sensor Dashboard</title>
|
||
<script src="https://cdn.socket.io/4.7.4/socket.io.min.js"></script>
|
||
<script src="https://cdn.jsdelivr.net/npm/chart.js"></script>
|
||
<style>
|
||
body { font-family: sans-serif; padding: 20px; background: #1a1a2e; color: #eee; }
|
||
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 20px; }
|
||
.card { background: #16213e; border-radius: 12px; padding: 20px; }
|
||
.value { font-size: 48px; font-weight: bold; color: #00d9ff; }
|
||
.label { color: #888; margin-top: 5px; }
|
||
canvas { max-height: 200px; }
|
||
</style>
|
||
</head>
|
||
<body>
|
||
<h1>Pi Sensor Dashboard</h1>
|
||
|
||
<div class="grid">
|
||
<div class="card">
|
||
<div class="value" id="temperature">--</div>
|
||
<div class="label">Temperature (°C)</div>
|
||
</div>
|
||
<div class="card">
|
||
<div class="value" id="humidity">--</div>
|
||
<div class="label">Humidity (%)</div>
|
||
</div>
|
||
<div class="card">
|
||
<canvas id="chart"></canvas>
|
||
</div>
|
||
</div>
|
||
|
||
<script>
|
||
const socket = io();
|
||
|
||
const ctx = document.getElementById('chart').getContext('2d');
|
||
const chart = new Chart(ctx, {
|
||
type: 'line',
|
||
data: {
|
||
labels: [],
|
||
datasets: [{
|
||
label: 'Temperature',
|
||
data: [],
|
||
borderColor: '#00d9ff',
|
||
tension: 0.4
|
||
}, {
|
||
label: 'Humidity',
|
||
data: [],
|
||
borderColor: '#ff6b6b',
|
||
tension: 0.4
|
||
}]
|
||
},
|
||
options: {
|
||
responsive: true,
|
||
scales: { y: { beginAtZero: false } }
|
||
}
|
||
});
|
||
|
||
socket.on('sensorData', ({ deviceId, data }) => {
|
||
document.getElementById('temperature').textContent = data.temperature?.toFixed(1) || '--';
|
||
document.getElementById('humidity').textContent = data.humidity?.toFixed(1) || '--';
|
||
|
||
// Chart Update
|
||
const time = new Date(data.timestamp).toLocaleTimeString();
|
||
chart.data.labels.push(time);
|
||
chart.data.datasets[0].data.push(data.temperature);
|
||
chart.data.datasets[1].data.push(data.humidity);
|
||
|
||
if (chart.data.labels.length > 20) {
|
||
chart.data.labels.shift();
|
||
chart.data.datasets.forEach(ds => ds.data.shift());
|
||
}
|
||
|
||
chart.update('none');
|
||
});
|
||
|
||
socket.on('initialData', ({ deviceId, history }) => {
|
||
history.forEach(data => {
|
||
const time = new Date(data.timestamp).toLocaleTimeString();
|
||
chart.data.labels.push(time);
|
||
chart.data.datasets[0].data.push(data.temperature);
|
||
chart.data.datasets[1].data.push(data.humidity);
|
||
});
|
||
chart.update();
|
||
});
|
||
</script>
|
||
</body>
|
||
</html>
|
||
```
|
||
|
||
---
|
||
|
||
## Systemd Service
|
||
|
||
```ini
|
||
# /etc/systemd/system/sensor-node.service
|
||
[Unit]
|
||
Description=Raspberry Pi Sensor Node
|
||
After=network.target
|
||
|
||
[Service]
|
||
Type=simple
|
||
User=pi
|
||
WorkingDirectory=/home/pi/sensor-node
|
||
ExecStart=/usr/bin/node dist/apps/sensor-node.js
|
||
Restart=always
|
||
RestartSec=10
|
||
Environment=NODE_ENV=production
|
||
Environment=MQTT_URL=mqtt://localhost:1883
|
||
|
||
[Install]
|
||
WantedBy=multi-user.target
|
||
```
|
||
|
||
```bash
|
||
# Service aktivieren
|
||
sudo systemctl daemon-reload
|
||
sudo systemctl enable sensor-node
|
||
sudo systemctl start sensor-node
|
||
|
||
# Status prüfen
|
||
sudo systemctl status sensor-node
|
||
journalctl -u sensor-node -f
|
||
```
|
||
|
||
---
|
||
|
||
## Fazit
|
||
|
||
Raspberry Pi mit Node.js bietet:
|
||
|
||
1. **Full Linux**: Komplettes OS mit npm-Ökosystem
|
||
2. **GPIO Access**: Direkte Hardware-Steuerung
|
||
3. **Networking**: WiFi, Ethernet, Bluetooth
|
||
4. **Web Stack**: Express, Socket.io, React
|
||
|
||
Perfekt für IoT-Gateways und Edge Computing.
|
||
|
||
---
|
||
|
||
## Bildprompts
|
||
|
||
1. "Raspberry Pi with connected sensors and wires, IoT prototype"
|
||
2. "Web dashboard showing sensor data graphs, real-time monitoring"
|
||
3. "Smart home hub with Pi and multiple sensor nodes, IoT network"
|
||
|
||
---
|
||
|
||
## Quellen
|
||
|
||
- [Node.js on Raspberry Pi Guide](https://fleetstack.io/blog/nodejs-raspberry-pi-complete-guide)
|
||
- [InfluxDB + Node-RED + Raspberry Pi](https://www.influxdata.com/blog/node-red-influxdb-raspberry-pi-iot-sensor-tutorial/)
|
||
- [onoff GPIO Library](https://www.npmjs.com/package/onoff)
|
||
- [SitePoint GPIO Tutorial](https://www.sitepoint.com/getting-started-with-the-raspberry-pi-gpio-pins-in-node-js/)
|